储能科学与技术 ›› 2018, Vol. 7 ›› Issue (4): 667-673.doi: 10.12028/j.issn.2095-4239.2018.0069

• 研究及进展 • 上一篇    下一篇

一种新型的脲类溶剂在锂空气电池中的应用

任警, 黄志梅, 沈越, 黄云辉   

  1. 华中科技大学材料科学与工程学院, 湖北 武汉 430074
  • 收稿日期:2018-04-28 修回日期:2018-05-03 出版日期:2018-07-01 发布日期:2018-05-10
  • 通讯作者: 沈越,副教授,主要研究方向为锂空气电池、锂离子电池SOC、SOH实时监测以及纳米材料与器件,E-mail:shenyue1213@hust.edu.cn
  • 作者简介:任警(1992-),男,硕士研究生,主要研究方向为锂空气电池,E-mail:maplerj@hust.edu.cn
  • 基金资助:
    国家自然科学基金项目(51602223和51632001)。

Achieving high performance lithium-O2 battery by introducing a novel urea electrolyte

REN Jing, HUANG Zhimei, SHEN Yue, HUANG Yunhui   

  1. School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
  • Received:2018-04-28 Revised:2018-05-03 Online:2018-07-01 Published:2018-05-10

摘要: 在锂空气电池中,电解液对电池的充放电过程、放电产物的稳定性以及循环性能有着至关重要的影响。本文利用脲类溶剂1,3-二甲基-2-咪唑啉酮(DMI)作为新型的锂空气电池电解液,有效地增加了放电产物过氧化锂(Li2O2)的溶解度,促进其溶剂化,并改善Li2O2与正极之间的接触,使得电池性能得到有效提高。通过研究表明,相比较传统的醚类电解液四乙二醇二甲醚(TEGDME),DMI能将电池放电容量提升1.5倍,而充电过电位则降低了0.6 V,减少了高电位导致的副反应。同时,通过加入氧抑制剂,稳定溶剂中的氧自由基,减少放电中间产物对DMI的攻击,使得电池循环性能得到显著提高。

关键词: 锂空气电池, 电解液, 过氧化锂, 循环性能

Abstract: The development of rechargeable Li-O2 battery (LOB) has encountered bottlenecks at this stage. One of the biggest challenges is to lower the oxidation potential of Li2O2, the insulating and insoluble discharge product. In this paper, 1, 3-Dimethyl-2-imidazolidinone (DMI) is first to be used as electrolyte in LOB, which can increase the solubility of lithium peroxide, promote its solvation, and improve the contact between Li2O2 and cathode, resulting in an improved battery performance. Compared to the traditional TEGDME electrolyte, DMI can increase the charge capacity by 1.5 times, while decrease the charge overpotential by 0.6 V, which suppress the side reaction caused by high potential. At the same time, by adding oxygen inhibitors, the oxygen radicals in the solvent are stabilized, the nucleophilic attack on the DMI by the discharge intermediate product is reduced, and the cycle performance of the battery is significantly improved.

Key words: lithium-O2 battery, electrolyte, lithium peroxide, cycle performance

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